12 191 947 Exponent Status

Great Internet Mersenne Prime Search
GIMPS
Finding World Record Primes Since 1996

PrimeNet Exponent Status

M_n

Status

Details

Composite, with 1 known prime factor. Cofactor is composite.

Factored

Factor	Digits	Bits	Date
914273844509778145297	21	69.6	2021-07-01 21:55:32

ECM

Digits	B1	Curves
25	50000	2 / 280

Estimated T-Level: 20.0 ⓘ

TF below 2^62 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)	2002-12-16	Per Jessen	98A7F8BA21CEC95C	6407481
Verified (Factored)	2004-07-02	Bruce Canino	98A7F8BA21CEC95C	9978655

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2022-02-08	Poao	A0A9A57371A85EEA	1	2939789	5	3

History

Date	User	Type	Result
2024-05-27	nordi	NF-PM1	B1=500000, B2=428459850
2024-05-27	nordi	NF-PM1	B1=500000
2022-02-08	techn1ciaN	CERT	PRP Certification Proof certified good
2022-02-08	Poao	C-PRP	M12191947/914273844509778145297 : A0A9A57371A85EEA PRP proof power = 8 PRP: Verified Proof certified good
2021-07-01	ZacHFX	F	Factor: 914273844509778145297 / TF: 69-70
2018-11-12	riccardo uberti	NF-PM1	B1=430000, B2=8500000, E=12
2017-11-06	ramgeis	NF	no factor from 2^68 to 2^69
2015-07-12	Tha	NF	no factor from 2^67 to 2^68
2015-03-01	Tha	NF	no factor from 2^66 to 2^67
2013-10-03	Nesowa	NF	no factor from 2^65 to 2^66
2013-08-19	lycorn	NF	no factor from 2^64 to 2^65